Grinder



Sept. l0, 1929. o. D. KINSEY GRINDER 2 sheets-Sheet 1 Filed May 244, 1925 lil., l

Ipatented Sept. l0, 1929. I

UNITED STATES PATENT oFFlcE.

owEN D. xnIsEY, or wAUWA'rosA, WISCONSIN.

GRINDER.

Application led May 24,

metal surface-may be rapidly leveled and the saving of both time and tiles obtained.

The objects and advantages of my improved grinder will be readily comprehended from the 'following detailed description of vthe accompanying drawings, wherein Figure 1 illustrates my improved grinder in elevation.

Figure 2 is alongitudinal sectional view of my improved grinder, with an intermediate portion broken away.

Figure 3 is a longitudinal sectional view of a portion of the main cylinder, namely the motor containing and airl admitting port portions thereof.

Figure 4 is a cross sectional-view taken on :o the line 4-4 of Figure' 2.

' Figure 5 illustrates a modified form, in elevation, merely the grinding wheel end and a portion of the`motor containing cylinder being shown. :5 Figure 6 is a longitudinal sectional view of the same on a somewhat enlarged scale.

Figure 7 is a perspective view of the bearing housing or plug at the inner or valve end of the device. .o My invention relates to a grinder especially adapted for leveling down the worn surfaces of locomotive frame jaws and in the constructionshown in Figures 1 to 4, it comprises a main cylinder or outer casing 10 which con- 5 `stitutes a housing for a' rotary type of air motor or air rotor indicated generally at 11. The air motor is provided with a spindle 12 of predetermined length for the purpose of receiving a grinding `wheel 13 secured to the `0 spindle so as to rotate therewith.

1926. serial no. 111,158.

The cylinder 10 on one side and beyond the mounting of the air motor 11 is segmentally cut away as indicated at 14, see Figure 1, in order to provide a proper opening commensurate with the'size of and to/accommodate the grinding wheel 13 in order that the latter may be accessible and be applied to the material or surface on which the grinder is to operate.

The cylindrical housing 10 is formed to provide or afford a true alignment for the three radial ball-bearing mountings 15, 16 and 17 whereby the air motor is maintained in proper position and its free rotation permitted.

The airrotor is also provided with a trunnion 1 8 which receives a thrust collar 19, about which the ball-bearing 17 is mounted; and this end of the cylinder l() is provided with a plug or bearing housing 20; the cylindrical housing 10 and the bearing housing 20 beingshown apertured and provided with a suita le grease plug as at 21 which communicates with the spacing intermediate of the thrust` collar 19 ,and the ball-bearing mounting 17, as clearly shown in Figure 2, thus enab ing proper lubricationV of the bearings at this inner end of the motor or air rotor. The inner end of the spindle 12 is also provided with a thrust collar 22 substantially similar to the thrust collar 19; the thrust collar 22 being disposed intermediate of the ball-bearing mounting 16 and the-adjacent end of the' air rotor 11. The thrust collars 19 and 22 are intendedto rotate or revolve with the air rotor 11 and'these'thrust collars in turn provide `endwise bearings for the blades 23 of the air rotor.

The air motor or rotor 11 is in the nature of a cylinder provided with a plurality `of longitudinal slots, as for example three in number as shown at 24 in Figure 4, in each of which is secured or placed a loosely held or radially slidable blade member 23'which is free to move in and out radially through the action of centrifugal force. The cylindrical housing 10, at what may be termed the inner end of the spindle 12, is provided with a bearing housing 25 whereby the thrust collar 22 and the bearings 16 are suitably held in place and which, in conjunction with the bearingl housing 20 maintain the rotor or air motor in Vexhaust air passing throug proper position.relative to the inner. diameter of the cylindrical housing 10. That is to say, the housings 20 and 25 are so formed that the rotor cylinder or air rotor 11 will be held eccentrically in the main or outer housing 10, as clearlv shown in Figure 4, so that the blades of the rotor are caused to foll`ow an eccentric circle, in other words made to move inwardly and outwardly.

As shown in Figure 4, the turbine type of air motor or rotor 11 is mountedin the main cylinder or housing 10 with one side in snug relation with the wall of the outer cylinder 10. The portion of the main cylinder or housin 10 in which the rotor is mounted is provide with a muffler 26, which is provided with a plurality of air escape ports27 arranged at a predetermined point relative to or prearranged distance from the outlet ports 26a of the main cylinder or housing 10 so that the the ports 26a will be caused toA encircle or ilow'about the main housing or cylinder 10 within the milier 26 before the air is exhausted from the muffler through the exhaust ports 27 therein. As a result a current of air is made to iiow about the main 4housing 10 and constitutes a cooling medium. i

` One end of the main housing 10 is provided with a valve housing 28 shown threaded onto the end of the main housing or cylinder 10. The valve housing 28 is shown provided with a cone shaped valve 29 provided with the air inlet tube or stem 30, the outer end whereof is shown provided with a suitable union as at 31 for attachment to an air lline leading to a suitable source or supply of compressed air. Theivalve housing 28 is provided with air ducts 32 with which ports 33 in the valve 29 are adapted to re ster upon proper rotation of the valve 29 in uced by rotation or turning of handle 34 which is rotatabl mounted and held in place by sleeve 35 an the union 31;

' extent of rotation of the handle 34 being determined b a suitable stop pin shown at 36 Secured in the valve housing 28 and extending into the cii cumferential slot 37 of the sleeve 35. In order to maintain a'proper positioning of the cone shaped valve 29 relative to the ports and air ducts, I show the base of the valve chambered to receive a suitable compression spring as at 38 which at one end ears against the bearing housing 20 as shown in Figure 2; the spring maintaining a proper tension on the valve and therefore inducing the valve to keep its seat asis clearly apparent from the construction.

lThe outer end of the spindle 12 is provided with an end bearing housing 39 suitably secured to the outer end of the main housing or cylinder 10, as for example by the screws 40. The housing 39 is eccentrically bored, in keeping with the housing members 2O and 25 so as'v to receive the outer end of the spindle 12 and thus maintain the air motor or rotor 11 in its eccentric relation with the outer cylinder or housing 10. The housing 39 is formed to receive the ball bearing mounting 15 previouslyv referred to and also to receive a felt washer indicated at 41 arranged intermediate of the ball bearing mounting 15 and the inner wall or anged portion 42 of the housing 39;-

i by means of the llister head screw 48.

The grinding wheel 13 is shown secured on the spindle 12, so as to rotate therewith, by means of the collars 49 and 50, the ends whereof are in abutting relationy with the bearing members 16 and 15, respectively, with the result that endwise movement of either the rotor or grinding wheel is absolutely impossible. The inner end of the collar 49 is shown preferably provided with 'a felt washer 51; the washers 51 and 41 preventing the outflow of the lubricant or grease from the bearing housings 25 and 39 respectively. The bearing housing 25 is shown provided with a grease plug 52 for introducing lubricant into the space intermediate of the thrust collar 22 and the ball-bearing mounting 16.

In Figures 5 and 6 I illustrate a modification ofv my invention which is especially adapted for grinding or smoothing down welded surfaces and the like; the grinder, however, being operated by means of an air rotor identical in every respect with the air rotor disclosed in the previously described construction and which in turn is also mounted eccentrically within the outer casing or cylinder as in the previously described construction. In the modified form shownA in p Figures 5 and 6, the outer casing or cylinder 53 is shortened so as to terminate with the outer end of the bearing housing 54, which is substantially similar to bearing housing 25 and which encloses the thrust collar 22 and the'ball-bearing mounting 16 disposed about' the spindle 12 of the air rotor 11. rIhe housing 54 is provided with a tapped opening to receive the threaded end of a spindle and bearing housing 55 through which spindle 12 is disposed; the opposite end ofthe spindle housing 55 being enlarged and provided with the ball-bearings 56, while the spindle 12 is preferably provided with a felt Washer as at 57, all of which are maintained in place by means of the shield or wheel cover member 58 which has an externally threaded hub portion 59 which screws into the threaded endof the spindle housing 55 The shield or grinding wheel cover 58 is left open at the opposite side and is cut away segmentally as shown in Figure 5 for the protrusion of the grinding wheel G which is secured to the reduced portion of the spindle 12 by means of the collars 6l and the nut which screw onto the end of the spindle; the wheel 60 being made to revolve with the 4spindle.

The modification of Figures 5 and 6 show the outer casing or main housing formed in sections o r of separate pieces instead of the single piece housing shown in Figures l and 2 in order to facilita-te easy assembly and permit proper access to the various parts.

In the operation of my improved device, air is admitted from a suitable source of supply by properly turning handle 34 which in turn rotates the valve 29 and properly aligns its ports 33 with the air admitting ports 32 in the valve-housing; the ports 32 terminating in the circumferential portion 32a, which in turn communicates with the air duct 62 formed in the side wall of the` bearing plug or housing 20. The duct'62 is flared somewhat in one direction (see Figures 4 and 7) so as to establish communication with the air port portion 32"; the duct 62 being located on one side of the point of contact between rotor 11 and the wall of the cylindrical housing 10, while the exhaust ports 26a in the housing l0 are located on the opposite side of the point of contact; the rotor revolving in thodirection indicated by the arrow in Figure 4.

I have shown what I believe to be the simplest adaptations of myV invention which has been" described in terms employed merely as terms of description and not as terms of limitation as structural modifications may be made without, however, departing from the spirit of my invention.

l. In a grinder of the character described,

an elongated main housing internally cylindrical and having a cut-away portion at one end, an air rotor in said housing provided with atrunnion on one end an'd a grindlng wheel carrying spindle on'the other end,

thrust collars secured about the trunnion and said spindle and adapted to rotate with the rotor, antifriction bearing holding housings mounted in the main housing at opposite ends of the rotor and at the outer end of the spindle whereby the rotor is eccentrically mounted in the main housing in contact with one side therewith, an air admitting port disposed transversely of one of said bearing holding housings, exhaust ports in the side wall of the main housing at a point removed from the point ofcontact between the rotor and said main housing, an air control valve rotatably secured to one end of the main housing, a grease holding closure cap for the spindle receiving end of the housing, and a mufiler secured about the main housing and provided with discharge orts on the side of the housing opposite to he side provided with said exhaust ports. y

2. In a grinder ofthe character described, comprising a housing internally cylindrical, an air rotor mounted in said housing and provided with a grinding wheel carrying spindle, the rotor being provided with radially disposed slots, blades radially movable in said slots, bearing elements at opposite -ends of the rotor. whereby the latter is eccentrically mounted in said housing andI longitudinal movement of the blades prevented, said elements being arranged to provide lubricant holding chambers at both ends of the rotor,

lthe elements at one end being formed with an air admitting duct, an air control valve secured against the last mentioned element and provided with oppositely diverging ports, means for yieldingly forcing said valve in one direction to compensate for wear, and

a handle rotatably secured to one en'd of the housing for controlling said valve.

3. In a grinder of the character described,

a cylindrical shell provided with a shieldforming extension, eccentrically bored bearing housings spaced apart longitudinally in the shell against movement, a cylindrical block provided at one en'd with a trunnion and at the other end with a grinding wheel carrying spindle, the trunnion being journalled in one of said bearing housings while the spindle is journalled in the other bearing housings whereby the cylindrical block is eccentrically held in said shell in close. re-

lation therewith at one side ofthe shell, said vblock having radial slots extending length wise thereof, blade members loosely slidable in said slots, one of said bearing housings having a cut-away portion in its cylindrical side to provide an air duct, the cylindrical shell having ports therethrough at a point removed from the point of Contact between the shell and said cylindrical block," an air .controlling valve rotatably secured at one end of the shell and adapted to eect communication with said air duct in the bearing housing said valve having a tubular extension, a andle secured about said extension for rotating said valve, and a muiiler shell l.

ing mounted in one of said bearing housings while the spindle is journalled in the other bearing housings for holding said block eccentrically 1n said shell in close relation with vco one side of the shell, said cylindrical block having radial slots extending lengthwise thereof, blade members loosely slidable in said slots, thrust collars arranged in said bearin housings at each e'nd of the cylindrical lock so as to rotate with the latter and constitute closures for the ends of the radial slots, one of said bearing housings having an air-duct disposed lengthwise thereof, the cylindrical shell being provided with exhaust ports at a point removed from the point of Contact between the shell and cylindrical block, an 'air controllingvalve rotatably se-l cured to one end of the'fshell, a valve housing secured to the end of the shell about said valve against rotation and provided with ports adapted to register with the ports of said valve, a controlling handle for rotating said valve.

OWEN D. KINSEY. 

